How to Convert PST to OST: Is Direct Conversion Possible?

If you want to use PST data with an Exchange or Microsoft 365 account, you have come to the right place. In this guide, we’ll explain whether PST can be directly converted to OST and show you the correct methods for moving PST data into an Exchange or Microsoft 365 mailbox. We’ll also cover manual approaches and a professional solution for managing Outlook data. PST files are commonly used to store emails, contacts, calendars, and other Outlook data locally, while OST files are synchronized offline copies of Exchange or Microsoft 365 mailbox data. Let’s first understand why users need to move PST data to an Exchange mailbox and then explore the available solutions.

Table of Contents

Why Convert PST to OST?

Below is the list of the reasons why a user opts to convert PST to OST. Have a look at those reasons below.

OST files allow a user to work even when the server connection is unavailable.
Converting data to the OST file helps you to access it anytime you want without any delay.
You can even access the data in the offline mode which makes this a convenient option for business users.

Due to these reasons, many users seek trusted manual solutions that can safely convert PST to OST files. Below is the list of the solutions that are tried and tested by our experts and apparently they are also easy to follow.

How to Convert PST to OST?

There are various versions of MS Outlook, and there are different options available in each version. So to convert PST to OST, you need to follow different steps for each version. You can find the steps for each possible MS Outlook version in the below section of the article. You can explore the steps below.

Outlook 2003 and 2007 Version

Firstly, go to the MS Outlook on your computer.
Now, tap the File button and then click the Import and Export button, as shown below.
Further, the Import and Export wizard will display like this on the screen below. Now, click Import from another program or file and proceed to Next.
In this window, choose a Personal Folder File (.pst) and tap Next to proceed ahead.
In this window, choose the PST files and click Open, and then proceed to Next.
Here, choose the file that you want to import and hit the Finish button.
You will be able to see the PST files on the left side of the navigation pane.
Finally, click on the left pane to create a folder and drag and drop the PST files to the newly created folder.

Outlook 2010 Version

Firstly, open MST Outlook 2010 and click on the File option.
After that, tap the Open button and then hit Import.
In this wizard, click Import from another program or file and then click Next.
Choose the Outlook Data File(.pst) from Import a File box and then tap the Next button.
Search for the .pst file and pick the option Replace duplicates with items imported and then click Next.
Choose a folder that you want to bring in and click on the Finish button.
Lastly, in the left pane, right-click and tap on the New Folder option. Choose a suitable name to that folder and choose the files to transfer to the newly created OST folder.

Outlook 2013 and 2016 Version

Open your desktop Outlook application on your PC.
Now, go to File and then click on Open & Export, and then choose the Import/Export button.
Now, choose Import from another program or file from this window and tap the Next button.
Here choose Outlook Data File (.pst) from the new Window and then click Next to further continue the process.
Now, search for the personal storage file from the Import Outlook Data File window and proceed toward Next.
Now, choose the folder you want to transfer and click the Finish button.
Finally, all the imported files will be shown on the right side of the pane.

This is the process using which you can convert PST to OST. These methods will ensure the utmost folder hierarchy and will keep your files safe throughout the process. However, still, to be extra sure while transferring or converting any data, you always have its backup handy. So that your chances of losing your important information boil down to zero.

To back up your Outlook data, you can completely rely on the Regain Outlook.com Backup tool. It will help you take a backup of your important data into 20+ file formats/email clients. Also, the tool will ensure to maintenance of folder hierarchy and structure throughout the backup process.

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Conclusion

In this article, we have disclosed different ways to convert PST to OST files without hampering any data. Also, the methods are easy to use and do not hamper the data quality. Further, it is also important to take a backup of Outlook files while transferring or converting any data into different file format/email client.

Frequently Asked Questions

Q1: Can I directly convert PST to OST?
No. Outlook does not provide a direct PST-to-OST conversion option. Instead, add your Exchange/Microsoft 365 account to Outlook and import or copy the PST data into the mailbox. Outlook then creates and synchronizes the OST automatically.

Q2: Is PST better than OST?
Neither is better; they serve different purposes. PST is mainly used for local storage, archiving, and transferring Outlook data, while OST is a synchronized offline copy of an Exchange/Microsoft 365 mailbox.

Q3: How do I import PST into Microsoft 365?
Add your Microsoft 365 account to classic Outlook, open the PST file, and copy or import its data into the Microsoft 365 mailbox. Outlook will synchronize the mailbox data with the server.

Q4: How do I move PST emails to an Exchange mailbox?
Open the PST in classic Outlook, select the required emails or folders, and copy or move them to the Exchange mailbox. Outlook will then synchronize the data with the Exchange server.

Q5: Does Outlook automatically create an OST?
Yes. When you configure a supported Exchange or Microsoft 365 account in classic Outlook with Cached Exchange Mode, Outlook automatically creates an OST file to store a local synchronized copy of mailbox data.

Q6: Can I open an OST without an Exchange account?
Generally, no. An OST is associated with the Exchange/Microsoft 365 account that created it. If the original account is unavailable and you need to recover its data, an OST to PST recovery tool may be required.

Q7: Can I import PST into New Outlook?
New Outlook supports access to PST data, but its PST capabilities differ from classic Outlook and some import features remain limited. For full PST import and management, classic Outlook is generally the better option.

Q8: What is the difference between PST and OST?
A PST stores Outlook data locally and is portable between supported Outlook environments. An OST is a local synchronized cache of an Exchange/Microsoft 365 mailbox and is normally linked to the configured account.

Q9: Can I convert OST to PST?
Yes. If you need to recover mailbox data from an inaccessible or orphaned OST, you can use Regain OST to PST Converter to extract mailbox items and save them in PST and other supported formats.

Q10: Can I use an old OST on another computer?
Normally, no. An OST is tied to the Exchange/Microsoft 365 account and Outlook profile that created it. To access the data on another computer, reconnect the original account or use an OST conversion tool if the original account is unavailable.

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